iv CONTENTS. 
XV. On the Influence of Temperature on the Photo-Electric 
Discharge from Platinum. By W. Mansergh Varley, 
D.Sc. (Manchester and Leeds), Ph.D. (Strassburg), B.A. 
(Cantab.), Assistant Professor of Physics and Electrical 
Engineering, and Fred. Unwin, M.Sc. (Manchester), 
Assistant Lecturer in Physics, Heriot-Watt College, Edin- 
burgh. (Communicated by Professor F. G. Baily, M.A., 
M.I.E.E.), 
(Issued separately May 31, 1907.) 
XVI. The Theory of Axisymmetric Determinants in the Historical 
Order of its Development up to 1860. By Thomas Muir, 
LED., 
(Issued separately , 1907.) 
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